相关实验视频

Updated: May 21, 2025

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

沿海牧场对水中可提取的不同来源的影响

Alexander J Koiter¹, Tamaragh Y Malone²

¹Department of Geography & Environment, Brandon University, Brandon, Manitoba, Canada.

Journal of environmental quality

|March 22, 2025

概括

通过放牧或割草来管理河岸植被,可以减少农业流域的损失. 这些做法减少了生物质中可从水中提取的,特别是在较低的河岸地区,减轻了潜在的水质影响.

科学领域:

环境科学环境科学
农业科学农业科学
水质管理水质管理

背景情况:

沿海区域对于缓冲农业流域的污染物至关重要.
然而,在寒冷的气候下,沿海地区可以成为 (P) 的来源.
了解河岸地区的分布是减轻水污染的关键.

研究的目的:

评估畜牧放牧和收获如何影响沿海地区的分布.
研究水可提取 (WEP) 的空间和垂直分布.
在不同的管理处理下评估WEP的生物质,垃圾,有机层和土壤地平线.

主要方法:

在四个来源 (生物质,垃圾,有机层,Ah地平线) 测量了沿河梯度的WEP.
实施了三种处理:放牧,高密度放牧和割草,以及对照.
在处理前后分析了WEP的空间和垂直分布.

主要成果:

最初,Ah地平线 (0-10厘米) 拥有最大的WEP池 (约. 44%) 的比例.
生物质占WEP的很大一部分 (约. 25%) 在治疗前.
高密度放牧和割草显著减少了WEP的生物质 (分别为10.4和18.7毫克米2),特别是在较低的河岸地区.

结论:

植被管理,包括短期秋季放牧和收获,可以减少损失的潜力.
这些做法可以在关键的融雪期间减轻P损失.
需要对融和洪水等沿海过程进行进一步的研究,以充分评估P损失风险.

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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

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相关概念视频

The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

Responses to Drought and Flooding

Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.

Trophic Levels

Trophic Levels

All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food from either solar or chemical energy. Each subsequent level obtains energy from the levels below. Detritivores can occupy any of the levels above primary producers.

Adaptations that Reduce Water Loss

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.